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Lagrangian and Eulerian views into a turbulent boundary layer flow using time-resolved tomographic PIV

Schröder, Andreas und Geisler, Reinhard und Wieneke, Bernd und Elsinga, G.E. und Scarano, Fulvio (2008) Lagrangian and Eulerian views into a turbulent boundary layer flow using time-resolved tomographic PIV. 14th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 2008-07-07 - 2008-07-10, Lisbon (Portugal).

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Kurzfassung

The momentum exchange mechanisms in a turbulent boundary layer flow are of manifold temporal and spatial scales and governed by the organization of self-sustaining coherent flow structures driven by entrained high momentum fluid. Generic flow structures such as hairpin-like vortices and spanwise alternating wall bounded low- and high-speed streaks have been observed and extensively analyzed with both experimental and numerical methods, e.g. by means of PIV [1, 2] or DNS [3]. In many studies the role of these structures for the wall normal and spanwise fluid exchange has been highlighted mostly within an Eulerian reference frame. But for a full understanding of the momentum exchange in turbulent flows a step to a spatially resolved Lagrangian frame of reference would be advantageous. However, experiments measuring turbulent flows in a Lagrangian reference frame need techniques which allow following the trajectory of (single) particles in a high temporal resolution comparable to the smallest turbulence time scales and at the same experiment also for a long observation time in order to cover also the integral time scales. Up to now the Lagrangian turbulence characterization has been performed by statistical analysis over several spatially independent single particles measured by tracking methods [4, 5]. Using these techniques the achieved spatial resolution did not allow describing the coherent structures. One of the challenges of experimental turbulence research is therefore the combination of both viewpoints in a single experiment.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Lagrangian and Eulerian views into a turbulent boundary layer flow using time-resolved tomographic PIV
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Schröder, AndreasNICHT SPEZIFIZIERT
Geisler, ReinhardNICHT SPEZIFIZIERT
Wieneke, BerndLaVision GmbH, Göttingen, Germany
Elsinga, G.E.Delft University of Technology, Department of Aerospace Engineering, Kluyverweg 1, 2629HS, Delft, The Netherlands
Scarano, FulvioDelft University of Technology, Department of Aerospace Engineering, Kluyverweg 1, 2629HS, Delft, The Netherlands
Datum:2008
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Name der Reihe:Conference Proceedings USB-Stick, Book of abstracts
Status:veröffentlicht
Stichwörter:turbulent boundary layer, high-speed streaks, tomographic PIV, PIV
Veranstaltungstitel:14th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Veranstaltungsort:Lisbon (Portugal)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2008-07-07 - 2008-07-10
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren
Hinterlegt von: Ilka Micknaus
Hinterlegt am:29 Jul 2008
Letzte Änderung:27 Apr 2009 14:41

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